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An instrument for measuring degrees of heat above those indicated by the mercurial thermometer.

A forestaff.

A very sensitive modification or application of the thermopile, used for indicating minute changes of radiant heat, or temperature.

A contrivance for exhibiting and measuring the refraction of light.

Same as Rheometer.

or measuring currents, especially the force or intensity of electrical currents; a galvanometer.

An instrument, acting on the principle of Pitot's tube, for measuring the velocity of a fluid current, the speed of a ship, etc.

An instrument for marking time in musical movements. See Metronome.

See Rhysimeter.

lution, as the juice of a plant, or brewers' and distillers' worts. [Written also saccharometer.]

A saccharimeter.

trument for measuring the amount of salt present in any given solution. [Written also salometer.]

A salimeter.

See Salimeter.

An instrument for determining with accuracy the degree of hardness of a mineral.

An instrument for measuring the direction, duration, and force of earthquakes and like concussions.

Half of a diameter; a right line, or the length of a right line, drawn from the center of a circle, a sphere, or other curved figure, to its circumference or periphery; a radius.

An instrument or apparatus for comparing and grading the sensitiveness of plates, films, etc., as a screen divided into squares of different shades or colors, from which a picture is made on the plate to be tested.

See Seismometer.

An instrument for indicating and recording shocks to railway cars occasioned by sudden stopping.